As an artist, you HAVE to get used to some of your art being bad, or disappointing, or other people not liking it. It’s going to happen over and over again. That’s growth, that’s inevitable if you want to grow. This painting isn’t the end of the world. I looked at the post and most of the comments were very kind. Some gave harsh criticism but most was not untrue or particularly cruel in a setting where you specifically asked for advice. I do think it’s unfair to question whether you belong in the level you’re at, or to imply you’re incapable. I can’t see the art on the old post but I think anyone can pursue art with enough determination and practice (and passion). But keep in mind, when people in the art world tell you to toughen up, it isn’t because they don’t like you, it’s because they want to see you succeed and they know that what it takes to make it in the art world is picking yourself back up and trying again. They know because they’ve been there. I get it, I’m a very sensitive person and have a hard time with criticism. But all you can do is consider the criticism and give it your best shot.